A phase-field study of domain dynamics in ferroelectric BCT-BZT system

Bandyopadhyay, Soumya and Jogi, Tushar and Miriyala, Kumaraswamy and Ramadurai, Ranjit and Bhattacharya, Saswata (2016) A phase-field study of domain dynamics in ferroelectric BCT-BZT system. MRS Advances, 1 (40). pp. 2783-2788. ISSN 2059-8521

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We present a thermodynamically consistent phase-field model describing the free energy of perovskite-based BCT-BZT solid solution containing an intermediate morphotropic phase boundaries. The Landau coefficients are derived as functions of composition of zirconium. The electrostrictive and elastic constants are appropriately chosen from experimental findings. The resulting Landau free energy is constructed to describe the stable polarization states as a function of composition. The evolution of the polarization order parameters at a particular composition is described by a set of time-dependent Ginzburg-Landau (TDGL) equations. Additionally, we solve Poisson's equation and mechanical equilibrium equation to account for the ferroelectric/ferroelastic interactions. We have performed two dimensional and three-dimensional simulations with appropriate electrical boundary conditions to study the effect of external electric field on domain dynamics in BCT-BZT system at the equimolar composition.

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IITH Creators:
IITH CreatorsORCiD
Ramadurai, Ranjithttp://orcid.org/0000-0003-2991-0027
Bhattacharya, SaswataUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: THIN-FILMS; CERAMICS
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 07 Nov 2017 07:03
Last Modified: 07 Nov 2017 07:03
URI: http://raiith.iith.ac.in/id/eprint/3658
Publisher URL: https://doi.org/10.1557/adv.2016.384
OA policy: http://www.sherpa.ac.uk/romeo/issn/2059-8521/
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